Table of Contents
Advertisement
Race
engine
approximately
2 000
rpm
under
no
load
Place your hand
on
air
outlet of
E A
R valve
to
check
for presence of
discharged
air
If
air is
felt E
A R
valve
is
normaL
5
If
E A R
valve does
not
function
properly
at
above steps
replace
E A R
valve
To
air
pump
I
ET267
Fig
EC 46
Cheeking
E A R volve
Anti backfire valve
A
valve
Warm
up
engine
thoroughly
2
Disconnect hose
from
air
cleaner
and
place
a
finger
near
the outlet
3
Run
engine
at
about
3
000
rpin
under
no
load
then
quickly
cetum it
to
idling
If you
feel
a
pull
or
suction
force
on
your
finger
the
anti
backfire
valve
is
functioning
normally
If
no
suction is felt
replace
the anti
backflre
valve
Fig
EC 47
Checking
anti
backfire
valve
1
t
D
I
Y1
VI
I
ID
4
JO
0
2
E
C
R control valve
3
E C
R passage
4
Intake manifold
5
Thermal
vacuum
valve
6
E C R tube
7
Exhaust
manifold
Emission
Control
System
tXHAUST
GAS
RECIRCULATION
CONTROL SYSTEM
E G R
DESCRIPTION
In
the
exhaust
gas
recirculation
system
a
part of the exhaust
gas is
returned
to
the
combustion
chamber
to
lower the
spark
flame temperature
during
combustion
This results
in
a
reduction
of the
nitrogen
oxide
con
tent
in
the
exhaust gas
The exhaust
gas
recirculation
sys
tem
consists
of
an
E
G
R
passage
E G R
con
trol valve
thermal
vacuum
volve
E G R
tube and hose
A
warn
@
I
ing
system which indicates
when the
E G R
control
system
must
be
in
spected
is
also installed
in
all 620
models
except
those
bound for Coli
fornia
and Canada
When
the
E
G
R
con
trol valve is
open
some
of the exhaust
gas is
led
from
the
exhaust manifold
to
the
E G
R
chamber
through
the
E G
R
passage
The exhaust
gas is
then
con
trolled
in
quantity
by
the E G
R
valve
and
is introduced into the
intake
manifold
Open
c1ose
operation
of the E G
R
control
valve
is
controlled
by
the
thermal
vacuum
valve which
opera
tes
on
carburetor
vacuum
and
engine
cool
ant
temperature
EC349
Fig
EC 4
Exhaust Gas Recirculation
system
E G R
E G
R
system
operating
Thermal
Intake
manifold
E
G
R
Remarks
E G
R
water
temperature
oC OF
vacuum
valve
vacuum
control valve
Below 570C 135OF
Close
Close
Non
cal i f o r n i a
Above
MfT
models
only
Idling
Not
Above
57 to
630C
Open
70
mmHg
Close
actuated
135
to
145OF
76
inHg
California models
Below
and N
on
Fullthrollle
f
alifomia
AfT
Above
57 to
6 oC
models
Actua ted
Open
Above
50
mmHg
Open
135
to
145OF
197
inHg
EC 19
OPERATION
Operation
of E G R
system
is
as
shown below
Advertisement
Table of Contents
